Wiper device, especially for windshields of automobiles

ABSTRACT

A wiper system, in particular for motor vehicle windows, having a driveable wiper arm ( 20 ) guided at one end on the motor vehicle, on the exposed end ( 21 ) of which a long-straggling wiper blade ( 12 ) capable of being placed against the window ( 16 ) with a wiper strip ( 22 ) is detachably hinge-mounted via a connection device ( 18 ) that has a pivot bolt ( 24 ) on the arm side, the axis of articulation of which extends substantially transversely to the longitudinal direction of the wiper blade in the working direction (double arrow  88 ) of the wiper system, and that has a coupling part ( 26 ) on the wiper-blade side in a center section of the wiper blade ( 12 ) on its side opposite from the window ( 16 ), which said coupling part has a bore-like bearing receptacle for a pivot bolt ( 24 ), whereby the bearing receptacle is open-edged along its cylindrical surface over a pass-through channel ( 70 ) for the pivot bolt ( 24 ) pointing in the direction of the bore axis, and said bearing receptacle is provided with a bottleneck ( 94 ) capable of being expanded elastically to the diameter ( 92 ) of the pivot bolt, the width of which said bottleneck is smaller than the diameter of the bore. A particularly reliable articulation between the wiper arm and the wiper blade that is capable of withstanding difficult working conditions results when the coupling part ( 26 ) is provided with a separate locking element ( 42 ) to form the bottleneck, which said locking element is capable of being moved, against a return force ( 96 ), from its locked position that blocks the pass-through channel into an open position that exposes the pass-through channel.

BACKGROUND OF THE INVENTION

[0001] A wiper system according to the invention comprises the drivenwiper arm as well as the wiper blade to be fastened on its one exposedend. The connection device required for this has appropriately developedcoupling means corresponding with each other on the arm side and theblade side.

[0002] The invention is based on a wiper system according to the generalclass of claim 1. In the case of a known wiper system of this type (DE23 13 689 A1), the wiper blade belonging to the wiper system and itscoupling part has a guide channel open toward a main body of the wiperstrip, in which a hair pin-shaped retaining spring is displaceablebetween an installation position and a locked position. This retainingspring serves to open or close a recess located in the coupling partthat represents the bearing receptacle for the wiper arm-pivot bolt. Theretaining spring is preloaded toward a rubber main body of the wiperstrip so that the friction between the rubber and the spring must beovercome in order to displace the spring. On the one hand, the abilityof the spring to be displaced must be easy to manage for the user, e.g.,when replacing the wiper blade, and, on the other hand, the spring mustreliably close the bearing receptacle in the channel wall during thewiping operation so that the wiper blade cannot detach unintentionallyfrom the wiper arm. These two opposing requirements cannot be fulfilledequally to satisfaction.

[0003] In the case of another wiper system (DE-PS 10 28 896) that doesnot have this deficiency, a coupling part on the wiper blade side isintegrally molded to the rubber-elastic wiper strip. The coupling parthas a bore-type bearing receptacle for a pivot bolt on the arm side thatcan be inserted in the bearing receptacle of the wiper bladetransversely to its longitudinal axis via an elastically-expandableinstallation slot. This type of articulation may function reliably atbest at low driving speeds and in the presence of small amounts ofprecipitation in the form of rain. When precipitation is strong and/ordriving speeds are high, or precipitation is present in the form ofsnow, particularly in the form of wet snow, the forces exerted by thewiper blade on the articulation can exceed the holding power of therubber-elastic coupling part and detach the wiper blade from the wiperarm.

ADVANTAGES OF THE INVENTION

[0004] The wiper system according to the invention having thecharacterizing features of claim 1 is unique by virtue of a simple andfunctionally-secure articulation between the wiper arm and wiper blade.To attach the wiper blade to the wiper arm, its pivot bolt is insertedinto the bearing receptacle of the wiper blade while the bottleneck istemporarily elastically expanded, whereby the locking element is movedinto its open position against the return force, so that the pivot boltreaches its bearing receptacle. The return force then automaticallymoves the locking element into its locked position. The locking elementcan be produced out of a material that is so stiff that the operatingforces acting on the point of articulation are absorbed between thewiper blade and the wiper arm without any negative consequences for thearticulation.

[0005] A simple design of the wiper system results from the fact thatthe coupling part has a housing part that is permanently interconnectedwith the wiper blade, on which said housing part the locking element isdisplaceably guided in the longitudinal direction of the wiper blade.

[0006] In order to obtain a particularly robust design of the couplingfor attaching the wiper blade to the wiper arm, the housing part has twoguide walls that extend in the longitudinal direction of the wiper bladeand are located at a distance from each other, between which the lockingelement is displaceably guided.

[0007] When, in a further embodiment of the invention, the bearingreceptacle for the pivot bolt of the wiper arm penetrates the two guidewalls as well as the locking element, whereby the recesses in the guidewalls adapted to the cross section of the pivot bolt and the lockingelement located in the locked position complement each other to at leastapproximately form a circle, as viewed in the direction of the axis ofarticulation, the result is a functionally-secure, free-from-play fixinginto position of the wiper arm-side pivot bolt in the coupling part ofthe wiper blade, therefore resulting as well in a smooth motion of thewiper blade over the window to be wiped. So that the wiper blade canalso be attached to the wiper arm by individuals not skilled in the art,each of the bearing receptacle sections developed in this fashion isopen toward the side of the coupling part opposite from the window overone section of the pass-through channel each, whereby the width of eachpass-through channel section is greater than the diameter of the pivotbolt.

[0008] The locking element is preferably loaded toward the lockedposition by spring means supported on the housing part. This can beobtained in cost-effective fashion by means of a helical compressionspring forming the spring means.

[0009] Installation of the coupling part can be simplified by the factthat the spring means are formed by a leg spring interconnected as asingle component with the housing part composed of an elastic plastic.

[0010] When the bearing section of the locking element is provided witha starting incline that is opposite from its recess at a distance andthat forms an acute angle α with the direction of displacement of thelocking element, the detachment of the wiper blade from the wiper armcan be achieved in simple fashion by moving the locking element into itsopen position, whereby the starting incline presses the pivot bolt outof the bearing sections into the guide walls.

[0011] A permanently stable guidance of the locking element between thetwo guide walls is obtained when the two guide walls are interconnectedby a bridge at one end section of the housing part.

[0012] In order to prevent mistakes during installation of the lockingelement in the housing part, the housing part has means for ensuring adefined working motion for the locking element located at a distancefrom the wiper strip.

[0013] These means can be formed in cost-effective fashion by means ofat least one strip-like projection on the inside of one guide wall thatextends in the direction of the working motion of the locking elementand with which a longitudinal groove matched to the cross section of theprojection and located on the side wall of the locking element facingthe projection is associated.

[0014] To secure the locking element in the housing part, a limitingshoulder pointing in the direction opposite from the working directionis situated on said housing part, which said limiting shouldercooperates with a counter-shoulder located on the locking element.

[0015] A further means for obtaining a free-from-play guidance of thewiper blade on the wiper arm can be obtained by the fact that the wiperarm has two side walls situated at a distance from each other andparallel to each other at least in the region of the pivot bolt, whichsaid side walls are arranged standing upright on the window, and onwhich the ends of the wiper arm are fastened, whereby the distancebetween the two side walls is matched to the width of the coupling part.The two side walls therefore overlap the outer sides of the two guidewalls opposite from each other in a manner that is free from play andcovers a large area.

[0016] A particularly low and easy-to-build wiper blade is obtained whenthe coupling part is held on the top surface—opposite from the window—ofa band-like long-straggling, spring-elastic carrier element, whereby itlies flat on said carrier element over at least one subsection, andwhen, furthermore, a rubber-elastic wiper strip capable of being placedagainst the window and arranged parallel to the longitudinal axis islocated on the bottom band surface of the carrier element facing thewindow.

[0017] Further advantageous further developments and embodiments of theinvention are presented in the subsequent description of exemplaryembodiments illustrated in the associated drawings.

SUMMARY OF THE DRAWINGS

[0018]FIG. 1 shows a side view of the schematic illustration of a wipersystem according to the invention.

[0019]FIG. 2 shows the enlarged perspective illustration of a detaillabelled “II” in FIG. 1, whereby the wiper blade is detached from thewiper arm.

[0020]FIG. 3 shows a cross section through the wiper blade along theline III-III in FIG. 2.

[0021]FIG. 4 shows a partial longitudinal sectional drawing through thewiper blade located in the attached position along the line IV-IV inFIG. 2.

[0022]FIG. 5 shows the arrangement according to FIG. 4 drawn in thedetaching position.

[0023]FIG. 6 shows another embodiment of the arrangement according toFIG. 4.

[0024]FIG. 7 shows the arrangement according to FIG. 6 in the detachingposition.

[0025]FIG. 8 shows an enlarged partial illustration of the arrangementsaccording to FIGS. 4 and 6 in an intermediate detaching position.

[0026]FIG. 9 shows a sectional drawing along the line IX-IX in FIG. 4.

[0027]FIG. 10 shows the arrangement according to FIG. 9 in the positionaccording to FIG. 5.

[0028]FIG. 11 shows a side view of a locking slide belonging to thewiper system.

[0029]FIG. 12 shows a top view of the locking slide according to FIG.11, partially cut.

[0030]FIG. 13 is a side view of a coupling part belonging to a wipersystem along the line XIII-XIII in FIG. 14, partially cut. FIG. 13 showsa top view of the coupling part according to FIG. 12.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] A wiper system 10 shown in FIGS. 1 and 2 has a wiper blade 12with a band-like long-straggling, spring-elastic carrier element 14. Aconnection device 18 lying flat on the carrier element is located on thetop surface of the band 13 of the carrier element opposite from thewindow 16 to be wiped, with the aid of which said connection device thewiper blade 12 can be detachably interconnected with a driveable wiperarm 20 belonging to the wiper system and guided at one end on the bodyof a motor vehicle. A long-straggling, rubber-elastic wiper strip 22 issituated parallel to the longitudinal axis on the bottom band surface 15of the carrier element 14 facing the window 16. A pivot bolt 24 servingas a coupling means on the arm side is held on the exposed end 21 of thewiper arm 20, which said pivot bolt is supported in a bearing receptacleof a coupling part 26 on the wiper blade side. The exposed end of thewiper arm 20 is loaded in the direction of the arrow 30 toward thewindow 16 to be wiped, the surface to be wiped of which is representedin FIG. 1 by a dash-dotted line 28. Since the dash-dotted line 28 isintended to represent the greatest curvature of the window surface, itis obvious that the curvature of the wiper blade 12 lying against thewindow with its two ends is greater than the maximum curvature of thewindow. Under the contact pressure (arrow 30), the wiper blade bearsagainst the window surface 28 with its wiper lip 32 along its entirelength. A tension therefore builds up in the band-like, spring-elasticcarrier element 14 that ensures that the wiper strip 22 or the wiper lip32 is seated properly against the motor vehicle window 16 along itsentire length. Due to the use of the carrier element 14, a wiper bladecarrier strap system (DE-PS 15 05 397) known for a long time is renderedsuperfluous.

[0032] The special embodiment of the wiper system 10 according to theinvention shall now be discussed in greater detail hereinbelow. Thewiper blade-side coupling part 26 of the connection device 18 isdesigned as a double component. It has a housing part 34 (FIGS. 13 and14) with two parallel guide walls 36 and 38 situated at a distance fromeach other and extending in the longitudinal direction of the wiperblade 12, which said guide walls are interconnected at its one endsection by means of a bridge-like member 40 ensuring the stability ofthe housing part. The two inner sides of the guide walls 36, 38 facingeach other form guide surfaces for a slide-like locking element 42(FIGS. 11 and 12) that also belongs to the coupling part 26. To ensure adefined working motion for the locking slide 42, a strip-like projection44 extending in the longitudinal direction of the wiper blade is locatedon each of the inner sides of the guide walls 36, 38 facing each other.To ensure a defined working motion, longitudinal grooves 46 located onthe locking slide 42 and matched to the cross section of the projections44 are associated with the strip-like projections 44. The slide-likelocking element 42 can therefore be slid, without play, between theguide walls 36 and 38 in the longitudinal direction of the wiper blade.To secure the locking slide 42 in the housing part 34, a limitingshoulder 48 pointing in the direction opposite from the working motionis located on each of the two projections 44. The two limiting shoulders48 cooperate with counter-shoulders located on the locking slide in itslongitudinal grooves in the sense of limiting the working motion. On theend section of the housing part 34 provided with the bridge 40, said endsection is provided with an end wall 52, the inner side 54 of whichfaces the limiting shoulders 48 at a distance. A helical coiled spring56 is supported on the inner side 54 in preloaded fashion (FIGS. 4 and9), which said helical coiled spring pushes the locking slide 42 builtinto the housing part 34 in the direction of the arrow 58 (FIG. 9),whereby the limiting shoulders 48 catch the locking slide 42 at itscounter-shoulders 50 when it has reached its locked position. Thehelical coiled spring 56 is thereby still under a slight preload. In anoperating position of the connection device 18 shown in FIG. 4, thelimiting shoulders 48 are situated at a slight distance away from thecounter-shoulders 50. This means that the locking slide 42 serving as alocking element is moved slightly in the direction of the arrow 60 (FIG.4) against the working direction of the helical coiled spring 56. Inthis operating position, the coupling part 26 is penetrated by abore-like bearing receptacle for the pivot bolt 24 transversely to thedirection of motion of the locking slide 42. The bearing receptacle 62therefore penetrates both guide walls 36, 38 and the locking slide 42.To facilitate a better understanding, the pivot bolt 24 has been drawnin cross section in FIG. 4. The recesses in the guide walls 36, 38resulting thereby are complemented by the recess 66 resulting in thelocking slide 42 in its locked position and approximately form a circlethat is matched to the cross section of the pivot bolt. So that thelocking slide can be moved in the direction of the arrow 60 from itsoperating position shown in FIG. 4 into an open position (FIG. 5), it isprovided with a recess 68 on the side opposite from its recess 66. Therecess is selected so large in size that it forms a pass-through channelsection for the pivot bolt. The recesses 64 in the guide walls 36, 38are also opened in the manner of a funnel via pass-through channelsections 70 (FIG. 13). The width of the pass-through channel sections isselected so that the pivot bolt 24 can be inserted easily into thewall-side recesses 64 in the direction of the arrow 72 (FIG. 13). As aresult of the recess 68 in the locking slide 42 that is dimensionedaccordingly, the pivot bolt 24 can also easily reach the bearing recess66 in the locking slide 42 (FIG. 11). This is only possible, however,when the locking slide 42 is moved into its open position shown in FIG.5 in the direction of the arrow 60 (FIG. 5) against the clamping forceof the helical coiled spring 56. In this open position, a pass-throughchannel 71 for the pivot bolt results, which said pivot bolt extendsover the entire width of the housing part, including the locking slide42 guided in said housing part. The bearing receptacle sections formedin this fashion and arranged in tandem in the direction of the axis ofthe pivot bolt 24—which said bearing receptacle sections are formed bythe recesses 64 and 66 in the housing part 26 and by the recess 68, 69in the locking slide 42—bare therefore open toward the side of thecoupling part 26 opposite from the window. The width of each section isthereby greater than the diameter of the pivot bolt. The recess 66 inthe locking slide 42 is provided with a starting incline 74 that isopposite from the recess 66 at a distance and that forms an acute angleα with the direction of displacement of the locking element (FIG. 8).

[0033] It is obvious in FIGS. 2 and 3 that the wiper blade-side couplingpart 26 of the connection device 18 is interconnected with the carrierelement 14 sitting on the top band surface 13 of the carrier element 14.In the region of the line of cut III-III, the carrier element 14 has twospring strips 80 gripping the wiper strip and located at a distance fromeach other and parallel to each other, the inside edges of which reachinto the longitudinal grooves of the wiper strip 22, and the outer edgesof which are gripped by longitudinal grooves 82 present in the guidewalls 36 and 38. The arrangement of the wiper strip 22 is therebyaffected such that it does not bear against the locking slide 42 andinfluence its working motion. As illustrated in FIG. 2, the wiper arm 20has a U-shaped cross section on its exposed end 21. It therefore has twoside walls situated at a distance from each other and parallel to eachother, which said side walls are situated standing upright toward thewindow. The two ends of the pivot bolt 24 are fixed at the side walls84. The distance 83 between the inner sides of the side walls 84 facingeach other is matched to the width 85 of the housing part 34 in such afashion that the side walls 84 overlap the outer sides of the guidewalls 36, 38 in a manner that is free from play. Excellent lateralstability for the wiper blade on the wiper arm therefore results whenthe wiper system 10 is moved in the direction of the double arrow 88(FIG. 2) over the window to be wiped.

[0034] An alternative to the arrangement of a helical coiled springillustrated previously is shown in FIGS. 6 and 7. Since this otherexemplary embodiment differs from the exemplary embodiment describedwith reference to FIGS. 4 and 5 only in terms of the design of thespring means, the reference numerals used previously for the lockingslide will be used again here. The coupling part 126 according to FIGS.6 and 7 also has a housing part 134 and a locking slide 42 with thecorresponding bearing receptacles 62, pass-through channels 71 andrecesses. The locking slide 42 also has a recess 68 with the startingincline 74. The housing part 134 is produced out of an elastic plastic,however. A leg spring 156 is integrally molded to the bridge connectingthe two guide walls 36 and 38, which said leg spring performs thefunction of the helical coiled spring 56 in the exemplary embodimentaccording to FIGS. 4 and 5. The leg spring 156 is adjusted so that itstill bears against the locking slide 42 with preload in the operatingposition (locked position) shown in FIG. 6. When the locking slide 42 ismoved in the direction of the arrow 60 and is brought into its openposition shown in FIG. 7, the leg spring 56 deflects with increasingtension, so that the locking slide 42 exposes the pass-through channelsections.

[0035] In addition to further described features, the wiper system 10according to the invention also has a bore-like bearing receptacle 62for the pivot bolt 24, whereby the bearing receptacle is open-edgedalong its cylindrical surface over a pass-through channel 71 pointing inthe direction of the bore axis. The pass-through channel is divided intothree different sections, whereby one section 70 each is located in theguide walls 36, 38, and a third section 68, 69 is located in the lockingslide 42. The pass-through channel sections in the two guide walls 36and 38 has a width 90 in the region of the bearing receptacle 62 (FIG.8) that is somewhat greater than the diameter 92 of the pivot bolt 24.

[0036] When the loose wiper blade 12 is to be attached to the wiper arm20, it is moved into the position shown in FIG. 2. The wiper blade isthen moved upward toward the pivot bolt 24, whereby the funnel-shapedrecess 64 in the guide walls 36, 38—together with the side walls 84 ofthe wiper arm end 21 sliding along the outer sides of the guide walls inthe direction of the arrow 72 (FIG. 8)—act as a very good installationaid. In this installation motion, the locking slide 42 is displaced bythe pivot bolt 23 in the direction of the arrow 60—while the tension ofthe spring means 56 and 156 increases—until the pivot bolt 24 reachesits bearing receptacle 62 formed by the recesses 64 and 66 (openposition). The locking slide then snaps into its operating positionshown in FIG. 4 under the effect of the spring means 56 and 156, whichis now substantially preloaded. The locking slide 42, with the upperedge 67 of its recess 66, now constricts the pass-through channel to abottleneck 94 (FIG. 4), the width of which is less than the diameter ofthe pivot bolt 23, so that the wiper blade 12 can no longer be detachedfrom the wiper arm 20 (locked position). The pivot bolt is thenpractically enclosed by parts of the coupling part 24.

[0037] To detach the wiper blade 12 from the wiper arm 20, the lockingslide 42 must be moved in the direction of the arrow 60 while thebottleneck 94 expands elastically, whereby the starting incline 74 ofthe locking slide 42 impacts the pivot bolt 24 and lifts it out of itsbearing receptacle 62, as illustrated in FIG. 8. As FIG. 8 furthershows, in this position, the bottleneck 94 is already expanded so farthat its width 90 is already greater than the diameter 92 of the pivotbolt 24 (open position). Accordingly, the wiper blade can be immediatelydetached from the pivot bolt, and, therefore, from the wiper arm, in thedirection opposite from the direction of the arrow 72. The wiper systemis therefore unique in that the coupling part 26 is provided with aseparate locking element 42 to form the bottleneck 94, which saidlocking element is capable of being moved, against the return force(arrow 96), out of its locked position—which corresponds to theoperating position—that blocks the pass-through channel into an openposition that exposes the pass-through channel (FIGS. 5 and 8).

What is claimed is:
 1. A wiper system, in particular for motor vehiclewindows, having a driveable wiper arm (20) guided at one end on themotor vehicle, on the exposed end (21) of which a long-straggling wiperblade (12) capable of being placed against the window (16) with a wiperstrip (22) is detachably hinge-mounted via a connection device (18),which said connection device has a pivot bolt (24) on its arm side, theaxis of articulation of which extends substantially transversely to thelongitudinal direction of the wiper blade in the working direction(double arrow 88) of the wiper system (10), and which has a couplingpart (26) with a bore-type bearing receptacle (62) for the pivot bolt(24) on the wiper blade side in the center section of the wiper blade onits side opposite from the window, whereby the bearing receptacle (62)is open-edged along its cylindrical surface over a pass-through channel(70) for the pivot bolt pointing in the direction of the bore axis, andsaid bearing receptacle is provided with a bottleneck (94) capable ofbeing expanded elastically to the diameter (92) of the pivot bolt, thewidth of which said bottleneck is smaller than the diameter of thebearing receptacle, wherein the coupling part (26) is provided with aseparate locking element (42) to form the bottleneck, which said lockingelement is capable of being moved, against a return force (96), from itslocked position that blocks the pass-through channel into an openposition that exposes the pass-through channel.
 2. The wiper systemaccording to claim 1, wherein the coupling part (26) has a housing part(34) permanently interconnected with the wiper blade (12), on which saidhousing part the locking element (42) is displaceably guided in thelongitudinal direction of the wiper blade (12).
 3. The wiper systemaccording to claim 2, wherein the housing part (34) has two guide walls(36, 38) extending in the longitudinal direction of the wiper bladelocated at a distance from each other, between which the locking element(42) is displaceably guided.
 4. The wiper system according to one of theclaims 1 through 3, wherein the bearing receptacle (62) for the pivotbolt (24) of the wiper arm (20) penetrates the two guide walls (36, 38)and the locking element (42), whereby the recesses (64, 66)—adapted tothe cross section of the pivot bolt—in the guide walls and in thelocking element located in the locked position complement each other toat least approximately form a circle as viewed in the direction of theaxis of articulation.
 5. The wiper system according to claim 4, whereineach of the bearing receptacle sections formed in this manner is openover one pass-through channel section each toward the side of thecoupling part (26) opposite from the window, whereby the width of eachsection is greater than the diameter of the pivot bolt (24).
 6. Thewiper system according to claim 5, wherein the locking element (42) isloaded toward the locked position by spring means (56 and 156) supportedat the housing part (34).
 7. The wiper system according to claim 6,wherein the spring means are formed by a helical compression spring(56).
 8. The wiper system according to claim 6, wherein the spring meansare formed by a leg spring (156) interconnected as a single componentwith the housing part (134) composed of an elastic plastic.
 9. The wipersystem according to one of the claims 4 through 8, wherein the bearingsection of the locking element (66) is provided with a starting incline(74) that faces the recess (66) in said bearing section at a distanceand which forms an acute angle (α) with the direction of displacement(60) of the locking element.
 10. The wiper system according to one ofthe claims 3 through 9, wherein the two guide walls (36, 38) areinterconnected at an end section of the housing part (34) by means of abridge (40).
 11. The wiper system according to one of the claims 2through 10, wherein the housing part (34) is provided with means (44)for ensuring a defined working motion for the locking element (42)located at a distance from the wiper strip (22).
 12. The wiper systemaccording to claim 11, wherein the securing means are formed by at leastone strip-like projection (44) on the inside of one guide wall (36, 38)that extends in the direction of the working motion of the lockingelement (42) and with which a longitudinal groove (46)—matched to thecross section of the projection (44)—on the side wall of the lockingelement (42) facing the projection is associated.
 13. The wiper systemaccording to one of the claims 11 or 12, wherein a limiting shoulder(48) is located on the housing part (26) oriented in the directionagainst the working motion that cooperates with a counter-shoulder (50)located on the locking element (42).
 14. The wiper system according toone of the claims 1 through 13, wherein the wiper arm (20)—at least inthe region of the pivot bolt (24)—has two side walls (84) located at adistance from each other and parallel to each other that are situatedstanding upright on the window (16) and to which the ends of the pivotbolt (24) are secured, and the distance (83) between the two side wallsis matched to the width (86) of the coupling part (26).
 15. The wipersystem according to one of the claims 1 through 14, wherein the couplingpart (34) is held on the top band surface opposite from the window (16),whereby it bears flat against said window at least over one subsection,and a rubber-elastic wiper strip (22) capable of being placed againstthe window is located parallel to the longitudinal axis on the otherbottom band surface (15) of the carrier element (14) facing the window.16. A coupling part for coupling a wiper arm having one wiper blade, inparticular for a wiper system according to one of the preceding claims,whereby the wiper arm has a pivot bolt (24), the axis of articulation ofwhich extends substantially transversely to the longitudinal directionof the wiper blade, having a bore-like bearing receptacle (62) for thepivot bolt (24), whereby the bearing receptacle (62) is open-edged alongits cover surface over a pass-through channel (70) for the pivot boltpointed in the direction of the bore axis, and the pass-through channelis provided with a bottleneck (94) capable of being elastically expandedto the diameter (92) of the pivot bolt, the width of which is less thanthe diameter of the bearing receptacle, wherein the coupling part (26)is provided with a separate locking element (42) to form the bottleneck,which said locking element is capable of being moved, against a returnforce (96), from its locked position that blocks the pass-throughchannel into an open position that exposes the pass-through channel. 17.A wiper blade for use in a wiper system according to one of the claims 1through
 15. 18. A wiper arm for use in a wiper system according to oneof the claims 1 through 15.